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<pre>
<a id='L1' name='L1'></a>dnl
<a id='L2' name='L2'></a>dnl Subshell support.
<a id='L3' name='L3'></a>dnl
<a id='L4' name='L4'></a>AC_DEFUN([mc_SUBSHELL], [
<a id='L5' name='L5'></a> 
<a id='L6' name='L6'></a>    AC_MSG_CHECKING([for subshell support])
<a id='L7' name='L7'></a>    AC_ARG_WITH(subshell,
<a id='L8' name='L8'></a>            [  --with-subshell          Compile in concurrent subshell @&lt;:@yes@:&gt;@
<a id='L9' name='L9'></a>  --with-subshell=optional Don't run concurrent shell by default @&lt;:@no@:&gt;@],
<a id='L10' name='L10'></a>            [
<a id='L11' name='L11'></a>                result=no
<a id='L12' name='L12'></a>                if test x$withval = xoptional; then
<a id='L13' name='L13'></a>                    AC_DEFINE(SUBSHELL_OPTIONAL, 1,  [Define to make subshell support optional])
<a id='L14' name='L14'></a>                    result="optional"
<a id='L15' name='L15'></a>                fi
<a id='L16' name='L16'></a>                if test x$withval = xyes; then
<a id='L17' name='L17'></a>                    result="yes"
<a id='L18' name='L18'></a>                fi
<a id='L19' name='L19'></a>            ],
<a id='L20' name='L20'></a>            [
<a id='L21' name='L21'></a>                dnl Default: enable the subshell support
<a id='L22' name='L22'></a>                result="yes"
<a id='L23' name='L23'></a>            ])
<a id='L24' name='L24'></a> 
<a id='L25' name='L25'></a>    if test "x$result" != xno; then
<a id='L26' name='L26'></a>        AC_DEFINE(ENABLE_SUBSHELL, 1, [Define to enable subshell support])
<a id='L27' name='L27'></a> 
<a id='L28' name='L28'></a>        dnl openpty() can simplify opening of master/slave devices for subshell
<a id='L29' name='L29'></a>        AC_CHECK_HEADERS([pty.h libutil.h util.h])
<a id='L30' name='L30'></a>        AC_CHECK_FUNCS(openpty,,
<a id='L31' name='L31'></a>            AC_CHECK_LIB(util,openpty,
<a id='L32' name='L32'></a>                [AC_DEFINE(HAVE_OPENPTY)
<a id='L33' name='L33'></a>                    LIBS="$LIBS -lutil"]
<a id='L34' name='L34'></a>            )
<a id='L35' name='L35'></a>        )
<a id='L36' name='L36'></a>    fi
<a id='L37' name='L37'></a> 
<a id='L38' name='L38'></a>    AC_MSG_RESULT([$result])
<a id='L39' name='L39'></a>    subshell="$result"
<a id='L40' name='L40'></a> 
<a id='L41' name='L41'></a>    AM_CONDITIONAL(ENABLE_SUBSHELL, [test "x$result" != xno])
<a id='L42' name='L42'></a>])
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